Fact Four

Neptune sometimes orbits the Sun further away than
Pluto. From 1979 to 1999,
Pluto was closer to the Sun
than Neptune. As Pluto was classified as a planet
at the time, Neptune was then the ninth planet from the Sun.

Fact Five

Triton orbits Neptune in the opposite direction to the planet's rotation. It is the only large moon in the Solar System to do this.

Fact Six

Neptune has four faint rings. Some parts of these rings are brighter in areas than others and appear like arcs orbiting the planet. Maybe they are still forming.

Fact Seven

Since its discovery in 1846, Neptune has completed only one full orbit of the
Sun. In fact, it takes 165 years for the planet to go around the
Sun.

Fact Eight

Neptune was discovered when scientists noticed something peculiar about
Uranus' orbit, believing something to be pulling it in the opposite direction to the
Sun's pull of gravity. They calculated the position of a planet and soon afterwards, discovered Neptune.

Fact Nine

The coldest temperatures measured in the Solar System (-230°c) have been recorded on Neptune's moon,
Triton.

Fact Ten

Pluto, a dwarf planet which has an orbit which sometimes crosses Neptune's, may have been a
moon of Neptune which escaped the planet's pull of gravity, but being prevented from escaping the Solar System by the gravitational pull of the Sun.